The object of the Butler Committee of 1927 was to?

(a) Define the jurisdiction of the Central and Provincial Governments.
(b) Define the powers of the Secretary of State for India.
(c) Impose censorship on national press.
(d) Improve the relationship between the Government of India and the Indian States.

A brief History of Modern India, Spectrum Publications, Chapter 12- The Indian States, Page 322:

The Butler Committee (1927) was set up to examine the nature of relationship between the states and Government.